Abstract
A new sterile line UP-3s, which carries the Dominant Early Maturity Gene (DEMG), was bred on the farm of University of Arkansas at Pine Bluff (UAPB). UP-3s and two check sterile lines, Jin23-A and Xie-A which do not carry the Dominant Early Maturity Gene, were crossed with a group of different maturity restorer lines, PB-1R, PB-5R, PB11, PB-13R, PB-20, PB-21, PB-22R, and PB-23R. Eighteen new hybrid rice combinations of these crosses were then tested at UAPB in 2012 and 2013. The results showed that panicle differentiation (PD) of hybrids from female parent UP-3s (DEMG) crossed with the 8 male parents, were earlier than the hybrids from female parent Jin23-A or Xie-A crossed with the 8 male parents. The PD of these earlier hybrids was before Jun 25 and heading was before July 20. Early PD and heading avoided the high temperature (over 34˚C) period which usually occurs after July 20 in Arkansas. The yields of these earlier maturity hybrids with female parent UP-3s were higher than those of the late maturity hybrids thatwereF1 progeny of sterile lines Jin23-A or Xie-A (these two female parent checks with non-DEMG). These results showed that the DEMG sterile line UP-3s can be adopted in making crosses with later ma- turity restorer lines to obtain earlier maturity hybrids to avoid the high temperature period in Arkansas.
Highlights
The rice heterosis has been known for a long time in rice research and production
In year 2012, the 4 hybrids (Table 2: UP-3s/PB-13R, UP-3s/PB-11R, UP-3s/PB-21R and UP-3s/PB20R), which were developed from sterile line UP-3s by crossed with late maturity restorer lines PB13R, PB11R, PB21R, and PB20R, headed between July 11-14 with 84 - 87 heading days, and their yields were 11,039, 10,985, 10,394, and 10,756 kg/hectare, respectively
The other 4 hybrids: Xie-A/ PB-1R, Xie-A/PB-13R, Xie-A/PB-11R, Xie-A/PB-21R and Xie-A/PB-20R which developed from check sterile line Xie-A by crossed with the same restorer lines, headed between July 22-31 with 95 - 104 heading days, and Heading date Heading days month_date Sowing-heading
Summary
The rice heterosis (hybrid vigor) has been known for a long time in rice research and production. Some early maturity hybrid rice combinations have been developed by usingUP-3s crossed with male parents of different late maturity restorer lines in UAPB rice research program 2011 and 2012.
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